Google App Script to mention discord user via webhook - google-apps-script

Question

I am looking to mention a user in a discord channel based on information set in a google sheet.
I have the script already pushing content from the google sheet to the discord channel so know that is working.
I can also get it to use the #everyone tag to mention everyone.
I am now wanting to get it set so that it only will mention the user.
Below is my script so far:
function onEdit() {
var wsID = " "
var sheet = SpreadsheetApp.openById(wsID).getSheetByName('discord');
var firestaff = sheet.getRange("A1").getValue();
var firecourse = sheet.getRange("B1").getValue();
var policestaff = sheet.getRange("A4").getValue();
var policecourse = sheet.getRange("B4").getValue();
var rescuestaff = sheet.getRange("A14").getValue();
var rescuecourse = sheet.getRange("B14").getValue();
var discordUrl = "",
options;
var firepayload = JSON.stringify({
content: "Please can " + firestaff + " start the " + firecourse + " courses. "
});
var policepayload = JSON.stringify({
content: "Please can " + policestaff + " start the " + policecourse + " courses.",
});
var rescuepayload = JSON.stringify({
content: "Please can " + rescuestaff + " start the " + rescuecourse + " courses."
});
var policemention = JSON.stringify({
content: "#everyone ",
})
var ssurl = JSON.stringify({
content: " "
});
var fireparams = {
method: "POST",
payload: firepayload,
muteHttpExceptions: true,
contentType: "application/json"
};
var policeparams = {
method: "POST",
payload: policepayload,
muteHttpExceptions: true,
contentType: "application/json"
};
var rescueparams = {
method: "POST",
payload: rescuepayload,
muteHttpExceptions: true,
contentType: "application/json"
};
var urlperms = {
method: "POST",
payload: ssurl,
muteHttpExceptions: true,
contentType: "application/json"
};
var policemen = {
method: "POST",
payload: policemention,
muteHttpExceptions: true,
contentType: "application/json"
};
UrlFetchApp.fetch(discordUrl, policemen)
UrlFetchApp.fetch(discordUrl, fireparams);
UrlFetchApp.fetch(discordUrl, policeparams);
UrlFetchApp.fetch(discordUrl, rescueparams);
UrlFetchApp.fetch(discordUrl, urlperms);
}

Answer 1

The only method available will be to create and store a list of users and their IDs, tagging them with <#THEUSERID>.
You can get the user IDs by right-clicking on a user's avatar.